Rectangular waveguide radiator miniaturization using electromagnetic infinity-shaped metamaterial resonator

A miniaturized open-ended rectangular waveguide antenna radiating below the cut-off frequency of the waveguide is proposed. Waveguide miniaturization is achieved by periodically loading the antenna with electromagnetic metamaterial (MTM) consisting of infinity shaped resonators. The metamaterial gives the waveguide the ability to support propagation of the backward wave below the cut-off frequency. The proposed open waveguide radiator was designed, optimized and simulated using High Frequency Structure Simulator HFSSTM commercial software. Comparing previous work of miniaturization of waveguides, a higher miniaturization ratio with a bandwidth about 327 MHz and good matching was obtained. Keywords:Waveguide miniaturization, left-handed media, metamaterials

A Novel Infinity Shaped Split Ring Resonator to Form a New Metamaterial

This paper proposes a new planner metamaterial whose unit cell is infinity-shaped split ring resonator. The cell is composed of two identical infinity-shaped copper patterns etched parallel on both sides of dielectric laminate. The metamaterial is very thin and easy to fabricate. The High Frequency Structure Simulator (HFSS) software was used to design, optimize and simulate the metamaterial unit cell. The effective material properties were retrieved from the calculated transmission and reflection characteristics of the structure. The characteristics and properties of the new metamaterial were plotted to show the material behavior. The new structure has very wide band frequencies, about 11.35 GHz, with negative refractive index. Keywords: Negative refractive index (NRI), metamaterial, Left-handed material, effective medium parameters